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Содержание bc632D

Страница 1: ...bc632D Wall Mount LED Display 8500 0015 User s Guide Rev A June 2000 ...

Страница 2: ...bc632D Wall Mount LED Display User s Guide March 1997 ...

Страница 3: ...ER ONE INTRODUCTION 1 0 General 1 1 1 1 Features 1 1 1 2 Overview 1 2 1 3 Time Code Formats 1 3 CHAPTER TWO INSTALLATION AND SETUP 2 0 General 2 1 2 1 Setup Internal Jumpers 2 1 2 1 1 Accessing Jumpers 2 1 2 1 2 Jumper Location 2 2 2 1 3 Jumper JP1 Control Bus Termination 2 2 2 1 4 Jumper JP2 RS 232 RS 485 Select for J3 Pin A6 2 3 2 1 5 Jumper JP3 RS 232 RS 485 Select for J3 Pin A1 2 4 2 1 6 Jumpe...

Страница 4: ... Keyboard Functions 3 3 3 2 3 Sound Control 3 6 3 2 4 On Off 3 6 3 2 5 Keyboard Batteries 3 7 3 3 Programming Details 3 7 3 3 1 Memory Structure 3 7 3 3 2 Selecting Steps 3 7 3 3 3 Editing 3 8 3 3 4 Source Select Time Source 3 8 3 3 5 Label Edit Text Labels 3 9 3 3 6 Format Change Display Format 3 10 3 3 7 Color Change Display Color 3 11 3 3 8 Duration Change Run Time of a Step 3 12 3 3 9 Link Lin...

Страница 5: ...MENTS 5 0 Phase Locked Loop Adjustment 5 1 CHAPTER SIX DRAWING SET 6 0 General 6 1 APPENDIX A DIGITAL TIME TRANSMISSION PROTOCOL A 0 Introduction A 1 A 1 Physical A 1 A 1 1 Device Connection A 1 A 2 Signal Description A 1 A 3 Cable A 2 A 4 Daisy Chaining A 2 A 5 Bussing A 3 A 6 Termination A 4 A 7 Logical Description A 4 A 7 1 Bit Rate Parity and Framing Bits A 4 A 7 2 Message Formats A 5 A 7 3 Di...

Страница 6: ...iption B 3 B 5 1 Bit Rate Parity and Framing Bits B 3 B 5 2 Command Formats B 4 B 5 2 1 Address B 4 B 5 2 2 Event B 4 B 5 2 3 Master B 5 B 5 2 4 Set Real Time Clock B 5 B 5 2 5 Source B 6 B 5 2 6 Label B 6 B 5 2 7 Format B 7 B 5 2 8 Color B 8 B 5 2 9 Duration B 8 B 5 2 10 Link B 9 B 5 2 11 Halt B 9 B 5 2 12 Step B 9 B 5 2 13 Set B 9 B 5 2 14 Start B 10 B 5 2 15 Stop B 11 B 5 2 16 Echo B 11 B 5 2 1...

Страница 7: ...be set to 19 hours The bc632D module has the capability to display eight 8 different local offset times from a single time source When the SELECT key is pressed again the display scrolls to the next source display offset time menu You may press the RUN function key to exit the SET TIME menu any time A 1 PROGRAMMING OFFSET via REMOTE The following brief example shows set local offset time on source...

Страница 8: ...ure also shares the same function key with SET TIME and OFFSET The following example sets current year to be leap year Press SHIFT D TIME hh mm ss SET TIME menu Press SELECT OFFSET 1 XX OFFSET 1 menu Press SELECT OFFSET 2 XX OFFSET 2 menu Press SELECT OFFSET 3 XX OFFSET 3 menu Press SELECT OFFSET 4 XX OFFSET 4 menu Press SELECT OFFSET 5 XX OFFSET 5 menu Press SELECT OFFSET 6 XX OFFSET 6 menu Press...

Страница 9: ...ADDENDUM A Datum Inc bc632D Wall Mount LED Display Rev A A 3 A 3 2 PROGRAMMING LEAP YEAR via RS422 addr aaa display address leapyear 1 set LEAP YEAR flag end ...

Страница 10: ...ADDENDUM A A 4 bc632 Wall Mount LED Display Rev A Datum Inc This Page Intentionally Left Blank ...

Страница 11: ...ly used time code formats IRIG B IRIG A NASA 36 and 2137 Decodes modulated or un modulated DC level shift time codes Master Slave operation allows digital synchronization of multiple bc632D s Up to six separate time channels multiplexed on one cable to multiple bc632D s Continues to provide time flywheels during loss of the external time code source Battery backed Real Time Clock maintains time du...

Страница 12: ...rformance Characteristics Item Item Description Time Code Reader Time Code Formats IRIG A B NASA 36 2137 Carrier Range IRIG A 10kHz 2 IRIG B 1 kHz 2 NASA 36 1 kHz 2 2137 1 kHz 2 Flywheel Accuracy Less than 3 6 milliseconds per hour Modulation Ratio 3 1 to 6 1 Input Amplitude 100 mVrms to 1 Vrms Input Impedance 10K Ω AC coupled Real Time Clock Format 24 Hour Accuracy 10PPM Power 7 VAC from provided...

Страница 13: ...ing and time correlation Hundreds of time code formats were developed one for each agency involved During the early 1960 s the InterRange Instrumentation Group promoted a series of standard time code formats now loosely referred to as IRIG Time Codes The bc632D decodes four of these formats IRIG A IRIG B 2137 and NASA 36 More complete details on these and other time code formats are available free...

Страница 14: ...CHAPTER ONE 1 4 bc632D Wall Mount LED Display Rev A Datum Inc Figure 1 1 IRIG Time Code Frame ...

Страница 15: ...erminated Control Bus Un Terminated J3 Rx Pins 1 and 6 RS 232 Levels BNC J2 1PPS Out BNC J4 Modulated Time Code Input If you only have one bc632D and you are using it with the internal clock or modulated time code and you have no need to use the event capture input then you do not need to change any of the jumpers If you need to use the event capture input DC level shift time codes or the networki...

Страница 16: ...nted on four white plastic spacers Figure 2 1 shows the location of the jumpers on the timing board 2 1 3 JUMPER JP1 CONTROL BUS TERMINATION When you use the Control Bus you must terminate the ends of the network with a 100Ω resistor The resistor may be external or internal to the bc632D To use the internal terminating resistor place the jumper on JP1 between pins 3 and 4 Otherwise place the jumpe...

Страница 17: ...display is to be connected directly to the RS 232 port of a computer then leave the jumpers between pins 1 and 2 of JP2 This routes pin A6 to an RS 232 driver If you are using the display as part of a daisy chained network put the jumper on pins 2 and 3 which routes pin A6 to the terminal of an RS 485 transceiver 1 2 3 4 1 2 3 4 Not Terminated Factory Setting Terminated Figure 2 2 Jumper JP1 Setti...

Страница 18: ...tes pin A1 to the terminal of an RS 485 transceiver Note If you use the RS 232 input be sure that JP6 is installed as described in Section 2 1 8 2 1 6 JUMPER JP4 SELECT EVENT OR 1PPS FOR BNC J2 Jumper JP4 is used to select the signal present on BNC connector J2 Normally the jumper is connected between pins 1 and 2 so that BNC J2 is used as a 1PPS output To use BNC J2 as an event input move the jum...

Страница 19: ...erwise place the jumper between pins 1 and 2 2 1 8 JUMPER JP6 CONTROL BUS SELECT Install the jumper on JP6 if RS 232 pins are being used that is if jumper JP3 is on pins 1 and 2 This tells the display that it must enable the RS 485 drivers that are being driven from the controlling computer If you are not using the RS 232 pins or a controlling computer then remove jumper JP6 This will cause the di...

Страница 20: ...s the modulated time code input BNC J4 can be used for other functions as shown in Figure 2 4 Note that the Event Input is available on either BNC J2 or J4 The Event Input would only be selected on J4 if the 1PPS output is required and the bc632D is using its internal clock or the RS 485 port as the source of time 1 2 4 6 8 3 5 7 1 2 4 6 8 3 5 7 1 2 4 6 8 3 5 7 Event Input DC Level Shift In Time C...

Страница 21: ...yhole slots most appropriate for your needs Step 2 Place two 8 screws into the wall mounting surface at the selected distances either 16 or 24 inches apart Use the type of screws and anchoring methods appropriate for the mounting surface For example use wood screws if you are mounting to a wood surface These screws are not supplied Step 3 Hang the display on the two screws located on the wall moun...

Страница 22: ...DO NOT tighten the screws until the sign and brackets are adjusted to the desired angle 2 2 4 COUNTERTOP Step 1 Attach the small end of the two mounting brackets to the display using the enclosed 10 screws and lockwashers Note that the brackets are different for the left and right sides The lockwashers must be placed between the mounting bracket and the sign DO NOT tighten the screws until the dis...

Страница 23: ...r conductor telephone cable When a valid 1PPS and time message is received from the Master synchronization takes place All features of the bc632D are available with this mode including flywheeling Refer to Figures 2 9 and 2 10 The signal received on the slaves RX connector are looped through to the TX connector allowing signs to be connected in a daisy chain fashion Terminate the RS 485 line with ...

Страница 24: ... female mating connector Figure 2 9 Serial Daisy Chain Connection of Master Slave bc632Ds RX TX Master bc632D RX TX RX TX RX TX Figure 2 10 bc632D Master Slave Serial Distribution Bus with multiple Drop Points Termination Choice of one of the two methods listed below Denotes direct 100W termination on RS 485 line Denotes termination by on board 100W resistors Necessary if RS485 line is not externa...

Страница 25: ...protocols is the synchronization accuracy between the master and slaves The multiplexed time protocol only keeps the master and slaves synchronized within one millisecond 2 4 CONTROL BUS If six conductor cable is used between bc632D s then the control bus pins will be connected This allows a computer to issue programming commands to all displays on the network Since RS 232 ports are more commonly ...

Страница 26: ...CHAPTER TWO 2 12 bc632D Wall Mount LED Display Rev A Datum Inc Page Intentionally Left Blank ...

Страница 27: ...ity Display Address for network operation 3 1 OPERATION When power is applied the bc632D begins displaying time using the parameters in memory This is it s normal Run mode When running one of several display formats will be displayed The bc632D allows you to select from several display formats to suit your application 3 1 1 LABELS In some formats an alphanumeric label is displayed on the left hand...

Страница 28: ... the status of the event capture input When the event capture is disarmed the event light is off When the event capture is armed the light is green It remains green until an event is detected when it turns red You must clear the event to capture a new event See Section 3 3 12 for programming the event capture parameters 3 1 3 PROGRAMMING The display remains in Run mode displaying time until the PR...

Страница 29: ... mind The keyboard must be pointed at the infrared receiver located on the right hand bottom of the display whenever keys are pressed The operator should have a clear view of the entire display when programming and MUST be at least 5 feet but not more than 30 feet from the unit The operator should be standing within 30 degrees of the direct front of the infrared receiver Make sure nothing reflecti...

Страница 30: ...CHAPTER THREE 3 4 bc632D Wall Mount LED Display Rev A Datum Inc Figure 3 1 Infrared Remote Keyboard ...

Страница 31: ...d LABEL Edit the alphanumeric label for the time display FORMAT Select the format of the time display COLOR Select the color of the time display DURATION Program number of seconds that this step will be displayed before going on LINK Link this step to next step in a sequence SELECT Step through a list of items during programming MASTER SHIFT C Enable or disable digital time transmissions SET TIME ...

Страница 32: ... is desired simply press the key No SHIFT key is needed The CAPS key only works on the 26 main letters A through Z Pressing a letter key normally produces a capital letter To produce lower case letters press the CAPS key To return to producing capital letters press the CAPS key again 3 2 3 SOUND CONTROL The wall display is equipped with a speaker and can generate a tone when you press any key exce...

Страница 33: ...y 3 3 1 MEMORY STRUCTURE The bc632D has eight memory locations which can each store a time source label format color duration and link flag Each memory location is called a step since they can be linked together to form a sequence of steps In the simplest case all steps are unlinked When a step is selected the time source label etc for that source are used to form the display Steps can be linked t...

Страница 34: ...aracter is the cursor The cursor shows you where the next character will appear The four keys on the bottom row of the keyboard are used during editing The BACK and ADV keys are used to move the cursor right or left so that you can edit different parts of the message The INSERT key is used to switch between the overtype mode of editing and the insert mode Normally if you type a character it replac...

Страница 35: ...own Time Code The display synchronizes to the external time code within 1 millisecond If the time code is lost the display will not continue to count Refer to Figure 3 2 for time code format You may run through the list of time sources by pressing the SELECT key or you may use the numbers 1 through A to select the corresponding time source Pressing the zero 0 key will cause the display to revert t...

Страница 36: ...D FRACT LBL first three label characters DDD days FRACT 1 10 000 of a day 5 LABEL Alphanumeric label with no time data Formats 6 through 10 are identical to steps 1 through 5 except that the status lights on the right hand end of the display are active 6 C DDD HH MM SS C Source Code Clock would be blank 7 LABEL HH MM SS Uses the first 5 label characters 8 DW MON D YR DW Day of week MON SUN MON D Y...

Страница 37: ...col N NASA 36 time code format blank Internal real time clock When Datum CD0 mode is selected the following display format is used CD SH HH MM SS CD pseudo IRIG B Countdown code format S sign H Hold Run mode L Lost Signal 3 3 7 COLOR CHANGE DISPLAY COLOR The COLOR key is used to select the color of the time display when it is running It does not affect the colors used in Program mode The display w...

Страница 38: ...s link turned OFF If the link is ON for step 8 then the sequence will continue with step 1 3 3 10 MASTER SHIFT C ENABLE DIGITAL TIME MASTER TRANSMISSIONS The MASTER key can be used to enable or disable the digital time transmissions of the bc632D If several displays are wired together on the same network one can act as a time master for the network The remaining displays on the network can synchro...

Страница 39: ...tomatically synchronize the internal clock to the time source each time power is applied to the display When the display reads Set Autosync you may press Y RETURN or RUN to activate this feature If you do not want to activate the autosync feature you may press a number key 1 4 or SELECT to select another item or you may press PROGRAM to abort The autosync feature is disabled by selecting the messa...

Страница 40: ...HIFT F CHANGE LOCAL ADDRESS The address key is used to enter a local address so a remote computer can selectively program displays The address is three characters long Any character can be used and case is significant Adr is not the same as adr or ADR When entering addresses be careful of using zero or the letter Oh since both look identical on the display Address 000 all zeroes is a wildcard addr...

Страница 41: ...first 5 label characters 3 DW MON D YR DW Day of week MON SUN MON D YR is month day year 4 LBL DDD FRACT LBL first three label characters DDD days FRACT 1 10 000 of a day 5 LABEL Alphanumeric label with no time data Formats 6 through 10 are identical to steps 1 through 5 except that the status lights on the right hand end of the display are active 6 C DDD HH MM SS C Source Code Clock would be blan...

Страница 42: ...R SHIFT C Enable digital time master SET TIME SHIFT D Set the time of the internal clock TIME HH MM SS DD MM YR Set internal clock Sync to TC Set Auto Sync Clear Auto Sync EVENT SHIFT E Set up event input HH MM SS mmm captured time Clear Event Clear the current event time to allow for a new event Rising Edge Set event to be captured when input goes high Falling Edge Set event to be captured when i...

Страница 43: ...ddress SHIFT number Select step 1 8 3 5 INITIAL PARAMETERS The bc632D initial factory parameters are shown below Source of time Internal real time clock Labels All labels are blank Formats Format 1 C DDD HH MM SS Color Red Duration 000 seconds Link Off Master Off Event Off No Edge Address 000 all zeroes ...

Страница 44: ...CHAPTER THREE 3 18 bc632D Wall Mount LED Display Rev A Datum Inc This Page Intentionally Left Blank ...

Страница 45: ...ut It may also be changed via internal jumper JP4 to an event input In both cases the signals use standard CMOS TTL levels See section 2 1 6 for setting JP4 4 2 J3 RS 485 SERIAL DIFFERENTIAL INPUT OUTPUT A serial RS 485 differential input output is available on the rear panel phone jack connector J3 The pinouts for J3 are listed in Tables 4 1 and 4 2 Figure 4 2 shows the orientation of the J3 pins...

Страница 46: ...feed 0AH The Tx signal will drive most RS 232 interfaces such as a serial port to a PC The data pacing signals RTS CTS DSR and DTR may need to be jumpered depending on the specific terminal emulation software in use Table 4 1 J3 RX Serial RS 485 I O Pinouts J3 RX Signal Description 1 RS 232 IN Control Rx 2 Ground 3 DATA RX 4 DATA RX 5 Ground 6 RS 232 OUT Control Rx Table 4 2 J3 TX Serial RS 485 I ...

Страница 47: ...rriage return and line feed characters Initialization Message bc632D f w 9501066 9 30 92 initialization complete time source XX Decoding modulated time code Time code type iriga irigb nasa36 2137 lev XX X represents a hexadecimal digit dif XXXX Time yy ddd hh mm ss See Note 7 Using internal clock RTC dif XXXX Time yy ddd hh mm ss See Note 7 Decoding RTC DC Level Shift time code Time Source iriga d...

Страница 48: ...85 data is only received by the bc632D when the display is configured as a Slave The normal message data broadcast from the Master is decoded by the Slave for time synchronization No control codes or commands are accepted through the time bus The RS 485 messages were provided primarily for diagnostic purposes However you may use the data to obtain time externally from the board Once a valid time c...

Страница 49: ...rough the BNC connector J4 Use pin 16 of U13 as the input to channel A of a dual channel oscilloscope Use the reference carrier selected in 2 above as the input to channel B of the oscilloscope Use channel A as the oscilloscope horizontal synch input The signal on pin 16 of U13 channel A is a square wave with nominal frequency of 1kHz It will jump to 10kHz periodically when the unit is looking for...

Страница 50: ...CHAPTER FIVE 5 2 bc632D Wall Mount LED Display Rev A Datum Inc This Page Intentionally Left Blank ...

Страница 51: ...Datum Inc bc632D Wall Mount LED Display Rev A 6 1 CHAPTER SIX DRAWING SET 6 0 GENERAL This chapter contains the schematic diagram assembly drawing and parts list for the bc632D following page 6 2 ...

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Страница 61: ...r for receiving timing signals Optionally the device can have a second RJ11 for transmitting or daisy chaining the signal The pin assignments for the devices are as follows Receiver Transmitter 1 n c 1 n c 2 GND 2 GND 3 TX 3 RX 4 TX 4 RX 5 GND 5 GND 6 n c 6 n c A 2 SIGNAL DESCRIPTION TX TX 5 Volt balanced signal complying with EIA RS 485 These lines carry the timing signals Several transmitters ma...

Страница 62: ...isy chaining is simple to install However the drawback is that any connector failure in the middle of the chain will block timing signals to devices beyond the failure Daisy chaining more than five devices is not recommended If a device has both a transmit and receive jack they should be connected internally like this RX TX 1 6 2 GND 5 GND 3 4 4 3 2 GND 2 GND 1 1 This arrangement allows the signal...

Страница 63: ...t female mating connector And a detailed view of the signal paths is shown here Device 1 Device 2 TX RX TX 6 n c cable 1 n c 6 n c cable 5 GND 2 GND 5 GND 4 TX 3 RX 4 TX 3 TX 4 RX 3 TX 2 GND 5 GND 2 GND 1 n c 6 n c 1 n c A 5 BUSSING Large numbers of devices should be connected in a bussed arrangement Up to 32 devices may be connected this way with a maximum cable length of 4 000 feet The main bus ...

Страница 64: ...n connector with female RJ11 mating connector Denotes termination by on board 100Ω resistors necessary if RS 485 line is not externally terminated A 6 TERMINATION Each end of a network should be terminated with a 100Ω Watt resistor between pins 2 and 5 This may be an external resistor or a resistor inside the unit at the end of the cable A 7 LOGICAL DESCRIPTION A 7 1 BIT RATE PARITY AND FRAMING BI...

Страница 65: ...eturn 0D and a line feed 0A There is a space after the word Time and case is significant YY is two ASCII numeric characters representing the year followed by a space Numbers from 90 to 99 refer to 1990 1999 and numbers from 00 to 89 refer to 2000 2089 is a single character representing the sign of the time It may be or representing time greater or equal to zero or representing time less than zero ...

Страница 66: ...near the on time mark In that case an alternative format is used In this format the reference is an 8 uS low going pulse near the on time mark Receiving devices can detect the pulse by setting the baud rate to 125kbps The pulse will be received as an FF character with no framing errors The format of the message is 8 µs pulse CR LF Time YY DDD HH MM SS µ µ µ µ µ µ CR LF Where The pulse must be sent...

Страница 67: ... TIME The multiplex time protocol is similar to the digital time protocol It is intended for an installationof several displays which may have to show different times It uses the same physical wiring configuration The format of the multiplexed time messages is CHNx YY DDD HH MM SS CR LF Where CHN is all capitals x is an ASCII character specifying the channel followed by a space is six ASCII hexade...

Страница 68: ...digital time the reference point is the stop bit of the first asterisk or the trailing edge of the 8 uS reference pulse For multiplex time the reference point is the stop bit of the first C of the CHN message The time tags specify the number of half microsecond units between the master s on time mark and the reference point For example a value of 0007D0 indicates that the stop bit of the most rece...

Страница 69: ...mark 7D0 hex 2000 decimal 2000 0 5 microseconds 1000 microseconds Figure B 1 IBM PC Compatible Connection IBM PC Compatible bc632D J3 RX RS 232 25 pin female RJ11 Pin Pin 2 1 RS 232 IN 1 2 GND 3 6 RS 232 Because both transmitters and receivers are connected to the same pair of lines all characters transmitted by the computer will be echoed back to the receiver This is a good way to determine wheth...

Страница 70: ...mended A daisy chained configuration is shown below Computer RX TX RX TX RX TX bc632D bc632D bc632D Denotes termination by internal 100Ω resistors 6 conductor phone cable with RJ11 male connectors RS 232 cable described above Device RJ11 port female mating connector B 3 BUSSING Large numbers of devices should be connected in a bussed arrangement Up to 32 devices may be connected this way with a ma...

Страница 71: ...ith RJ11 male connectors 6 conductor cable WIRED STRAIGHT THROUGH pin 1 to pin 1 Wall mount junction connector with female RJ11 mating connector Termination Choice of ONE of these methods Denotes external 100Ω termination on RS 485 line Denotes termination by on board 100Ω resistors Necessary if RS 485 line is not externally terminated B 4 TERMINATION Each end of a network should be terminated wit...

Страница 72: ...DRESS Each display on the network is programmed with a unique three character address using the remote keyboard The address cannot be changed using the serial port All displays on the network monitor all the messages on the network but only respond after they have received an address message with their own address The format of the address message is ADDR xxx where xxx is the three character addre...

Страница 73: ...ts the display from transmitting time messages The message format is MASTER x where x is 0 Master off or 1 Master on B 5 2 4 SET REAL TIME CLOCK To set the internal clock of the bc632D use this command TIME hh mm ss MM dd yy w Where hh is the hours mm is minutes ss is seconds MM is month dd is day of month yy is year w is day of week 1 Monday 7 Sunday Use leading zeros if necessary For Example 1 0...

Страница 74: ... of 1 Multiplex channel 1 2 Multiplex channel 2 3 Multiplex channel 3 4 Multiplex channel 4 5 Multiplex channel 5 6 Multiplex channel 6 7 Digital Time slave 8 Timecode input 9 Internal Real time clock A Datum CD0 B 5 2 6 LABEL Each step has a text label which can be displayed along with the time The format of the Label message is LABEL s labeltext Where s is the step 1 8 labeltext is the content o...

Страница 75: ...same ones that are used when programming from the remote keyboard Formats 1 through 5 do not show the status lights on the right hand end of the display 1 C DDD HH MM SS C Source Code Clock would be blank 2 LABEL HH MM SS Uses the first 5 label characters 3 DW MON D YR DW Day of week MON SUN MON D YR is month day year 4 LBL DDD FRACT LBL first three label characters DDD days FRACT 1 10 000 of a da...

Страница 76: ...S C Source Code Clock would be blank 7 LABEL HH MM SS Uses the first 5 label characters 8 DW MON D YR DW Day of week MON SUN MON D YR is month day year 9 LBL DDD FRACT LBL first three label characters DDD days FRACT 1 10 000 of a day 10 LABEL Alphanumeric label with no time data B 5 2 8 COLOR To change the color of a step use this command COLOR s x Where s is the step 1 8 x is the color 1 Red 2 Gr...

Страница 77: ... 8 x is 0 Link off or 1 Link on B 5 2 11 HALT The Halt command turns off time keeping in the display so that it can keep up with a large number of commands sent without delays This command will freeze the display then restart it when the END command is received The restart sequence is similar to the power on sequence The Halt command is not required if a short message is sent for example ADDR AAA ...

Страница 78: ...rogrammed to the Internal clock On power up the display will show the contents of the internal clock as normal When the display receives any of the countdown commands Set Start or Stop the display is forced into countdown mode From this point on the display will not show the internal clock time If you wish to resume operation using the internal clock you can send a Halt command followed by an End ...

Страница 79: ...nd of where the Stop occurred The format of the Start command is START B 5 2 15 STOP The Stop command will hold the countdown time on the display and freeze the time including the fractional part of a second It can also be used to initiate the countdown mode of operation before a Set command is issued The Stop command is simply STOP B 5 2 16 ECHO The Echo command tells the display to respond with ...

Страница 80: ... Echo command Do not use the Echo command with address 000 if more than one display is on the network Doing so will cause all displays to respond at once resulting in garbled data B 5 2 17 END The End command is used to terminate a group of commands begun with the Address command After the End command is received all displays are in a state in which they will not respond to any commands until anot...

Страница 81: ...data is being sent to a display The display only allocates a small portion of its CPU time to processing the serial commands Most of the time is taken in decoding time code and updating the display Because of this the display can lose characters when trying to read long messages that have no pauses between characters There are two ways to deal with this problem First the computer can be programmed...

Страница 82: ... changes to 000 00 00 09 END End At this point the display continues to count past zero and into positive time values The computer can freely issue commands to other displays if desired ADDR aaa Talk to display aaa again STOP Freeze display and halt time keeping START Resume time keeping HALT Issue Halt to stop time keeping and force a reset to get to normal internal clock operation END Display aa...

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